Distribution of electrical energy.



P. V. HUNTER. DISTRIBUTION OF ELECTRICAL ENERGY. APPLICATION FILED JUNE 21, 1912.

1,104,733.- Patentea July 21, 19m

A A A V V V V V 13 f/iy/zposz'tz'vc temp ara/tura o'acffz'ozjenb- 179M.

. 13 13 5 I fig UN TE P- rENT OFFICE.

mim Vassar. ntm'ria'm, or urinary, NEWCASTLE-UPON-LYNE, mtemnn.

' mashes ti -ammo. mess ng;

nected with the Distribution of Electrical Energy, of which the tollow ng. is a specrfi cation.

In large electricalpower supply stationsin which a number of powerful generators are at work a known practice is to connect the bus bars, into which the generators are pose ,of preventing any great and su den rush'of current from one to another of the.

said bus, bars on a breakdown or bad leak occurring in the mains. .The said choking coils are so selected or constructed as to ofi'er great impedance to short circu ts thus limiting the amount of current which can be transmitted throu h a short circuit. W th such choking-coils 51cm is an appreciable impedance when the generators are exchangin' current across the choking coils under or inary working conditions, which is undesirable.

- In the drawings Figure I is a diagram of i coils are usually employed. In the said figure, 1, 1' 1" are generators, 2 2" are leads connecting these generators w th b bars 3, 3', 3", and 4, 4t, 5, 5, 6, 6', are

mains running from the said bus bars. Ar-

ranged between the bus bars are the choking coils 7 7. When desired choking coils are sometimes placed inthe leads 2, 2, 2",

and also at other parts of the system. g

In carrying my invention into eifect mstead of employing chokin coils as ordinarily constructed and as escribed above, I employ a new type of choking device which I have invented, and so avoid the drawbackreferredto above. This new type of choking device embraces a material whose resistance increases with increase of current (hereinafter for the purposes of this specification termed a resistance with a high semi-taut; ti Letters Patent. inflection. 1161 111116 21, 1912, Serial N0. 704,998-

ordinary choking ingly low. I

Patented July 21,1914.

positive temperature coefiicient) such for example as 'a; conductor of osr'ani. A con-'- an osram lamp or a bank of osrai'n lamps and .a' way in which I contemplate using such is as follows. I place transformers betw?:en the bus bars (or, .when desired,

other parts ofv the system as-in: the case of I A coils). Inthe circuit of the secondary windings of'these transformrenient form of such resistance consists .of

em I place resistances having a high positive temperature coefiicient. By this means I,

a much better chokin e'fl'ect is" obtained.

My invention is diagrammatically illustrated in Figs. II and III.

Referring to Fig. II, it will be'seen that my chokingdevice consists in this case of the combination of a resistance with a high positive temperature coeflicient and a transformer. 10 is the ma netic circuit of the transrormer and 11 is t e primary winding thereof placed in series between the bus bars 3 and 3 12 is the secondary windingand in this is placed the resistance 13 having a high positive temperature coefiicient.

Fig. III differs from Fig. II inthat my choking device consists of the combination of three resistances "having a high positive temperature coefficient and a single transformer having three secondary windings. 10 is the magnetic circuit, 11 the primary winding, 3, 3 bus bars, all arranged .as in Fig. II. There arethree secondary windings 12, 12, 12 each embracing a' separate resistance 13, 13, 13".

I desire it to be'understood that I do not limit myself to any particular material with which to construct the resistance of my choking device. I however find that a conductor of osram is convenient.

I may so construct or arrange my resistances having a high positive temperature coefiicient as to present reactance as well as resistance in which case I may dispense with the transformers and use myresistance as a mere choke coil having both reactance and resistance.

In operation, it will be seen that during short circuits the resistance 13 in iny secondary circuit will be high and the reactance in the primary circuit correspondingly great, as is desired. Under normal conditions, the secondary resistance being low, thereactance of iio Having thus described my invention, what: I claim as new and' desire to secure by Letters Patent is: V

1. An electrical-distribution system comprising generators, bus-barsein seriesc0n-' nectedthereto, and a reactan'ce' between a'djacent bus bars having a high positive temperature coeflicie'nt substantially as described. g

2. An electrical distribution system comprising generators, bus-bars. inv series connected; therewith, a transformer having its primary. in series between two bus-bars and a reslstance with a high positive temperature coeflicient in the secondary circuit substantially ,as described.-

V '8, elctricalj distribution system comprisin generators, bus-bars in series connegte therewith, atransformer having its primary in series between two bus-bars and .a multiplicity of secondaries each with a resistance having a high sitive temperature coefficient in its-secon ary substantially as described, In witness whereof I have signed my name to this specification in the presence of two subscribing witnesses.

'PHILIPVASSAB HUNTER. Witnesses: NrxoN, I H. DUKE-I I 

